DIKE REPAIRS AT LES CÈDRES GENERATING STATION - Hydro-Québec
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DIKE REPAIRS AT LES CÈDRES
GENERATING STATION
INFORMATION Les Cèdres generating station was built in 1913 and 1914.
BULLETIN An embankment dike was also built upstream of the
powerhouse to create a headrace canal that would direct
FALL 2016 water from the Fleuve Saint-Laurent into the powerhouse.
A number of studies and inspections of this dike conducted
by Hydro-Québec show water infiltration and seepage from the
headrace canal. As a result, to ensure the long-term operability
of the facilities, Hydro-Québec must repair the fill of the
embankment dike of the Les Cèdres headrace canal.
The purpose of this project is to improve the watertightness
and stability of the dike and to minimize the risk of erosion
of its foundation.
74°8' s 45°14' 74°4' 74°0' 45°16' 73°56'
Boulevard Gérard-Cadieux
!
A Île aux
Vaches
A Cours d'eau Leboeuf-Léger
Sain
t
Bea -Étienn
uha e
rno -de-
is, M
Sealing work
Zone 1
Spillway
!
(
(decommissioned)
Inverted filter
Zone 2
Planned structure
Above water
Île à l'Ail
Inverted filter S
Under water (not visible)
A Direction of flow
0 75 150 m Saint-Timothée basin
!
(
Bike path MTM, Zone 8, NAD83 (CSRS)
(winter low water)
Document for information purposes only. For any other use, please contact Géomatique, Hydro-Québec Équipement et services partagés.
PROJECT DESCRIPTION
North side of the dike South side of the dike
Hydro-Québec will perform Hydro-Québec will add an inverted filter over a
sealing work over a distance distance of about 1,190 m in the Saint-Timothée
of about 350 m (zone 1) to basin (zone 2) and about 120 m in the Pointe-
reduce water infiltration into du-Buisson basin (zone 3). Composed of
the embankment dike. This several layers of granular fill, the inverted filter
involves partially excavating is designed to prevent particulate matter from
the slope of the dike and migrating outside the embankment in case
adding more than 100,000 m3 of infiltration and thus prevent erosion of the
of a mix of till, granular material foundation of the dike. Building the inverted
and rock. filter will involve preparing the foundation
and adding about 70,000 m3 of granular
The water level in the
material and rock.
Les Cèdres headrace canal
will be maintained at its usual Hydro-Québec also plans to stabilize the
level throughout the work. slope over a distance of about 175 m in the
A containment curtain will be Saint-Timothée basin (zone 2) and about 125 m
installed in the headrace canal in the Pointe-du-Buisson basin (zone 3). This will
to confine particles suspended involve dumping about 10,000 m3 of granular
during placement of the material and rock on the side of the dike.
new material.
The work on the south side of the dike will be
performed when water levels are lowest in the
Saint-Timothée and Pointe-du-Buisson basins,
that is, between November and April.
Vegetation control
Hydro-Québec has to cut down some of the trees on the dike to get to the work areas. Since trees
can weaken a dike, compromising its stability, Hydro-Québec will determine if other trees on the dike,
outside the work area, also need to be felled.
2
Les Cèdres
Les Cèdres
470
powerhouse
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Les Cèdres dam
Fleuve Saint-Laurent
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)
A
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735 kV
Sain
Riviè
Les Cèdres headrace canal
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re à la
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Chemin
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Gravity dam
Les Cèdres dike
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se
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!
(
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Chemin
éréol
ue
Chemin
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ainrt-Em
île Saveuse
Slope stabilization Inverted filter Pointe-du-Buisson
Ruisseau
t-GrSlope stabilization
Sain
basin
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20 égo
Saint-
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Zone 2 !
(
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Zone 3
TNO aquatique
e
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Lac
45°18' Coteau- 74°8' Vaudreuil- 74°4' 45°20' Ruis 74°0'
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ge
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rent
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30
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Île Les Cèdres Pointe-des-
Bienville dam dike uve Cascades
Chemin du Fle
!
45°20'
A
Chemin du
Île Pointe-des-
Juillet !
Les Cèdres
powerhouse
Cascades,VL Île
Cas des
45°16'
Île de Salaberry Île De cad
Île Pointe-du-Buisson Joybert e
d'Aloigny l'Île-Juillet-1 dam
Golf
dam
rles
Cha
201 Sa
int- Saint-Timothée
dam
132 Beauharnois,
Île a V
Cha ux Bar
ts Saint-Timothée sector
30 rag
L'Anc st
ien Ca e Oue
73°56'
nal vi èr
Salaberry-de- al
Ri Can
Valleyfield Infrastructure Boundary
du Regional county
45°18'
emin Hydropower generating
Rang Sainte-Mar ie Est station
Ch Rang Sainte-Marie Ouest
municipality (RCM)
Dam l
Municipality
na
Ca
45°14'
tit
Boulevard Pie XII
530 Highway
Beauharnois- 30 Pe
Salaberry-de- Le
Salaberry
Be Can Valleyfield, V 132 Provincial highway
0 1 2 km
au al (MRC)
ha de
338 Secondary highway
Stanislas- rn MTM, Zone 8, NAD83 (CSRS)
ostka, M oi Local road
74°8' s 45°14' 74°4' 74°0' 0002c_buc1_tet_014_projet_161018.mxd
45°16' 73°56'
Boulevard Gérard-Cadieux
!
A Île aux
Vaches
A Cours d'eau Leboeuf-Léger
Sain
t
Bea -Étienn
uha e
Les C
rno -de-
is, M
Sealing work F
Zone 1
Spillway
!
(
(decommissioned)
Inverted filter
Zone 2
!
(
Planned structure
Above water
Île à l'Ail
Inverted filter Slope stabi
Under water (not visible)
A Direction of flow
0 75 150 m Saint-Timothée basin
3MAIN IMPACTS ANTICIPATED ENVIRONMENT
DURING THE WORK As this project is subject to section 31.1 of the
Increase in traffic Environment Quality Act, Hydro-Québec will
file an environmental impact statement with
During the work, traffic will increase along route 132 at
the Ministère du Développement durable,
Salaberry-de-Valleyfield, between exit 9 of highway 530 and
de l’Environnement et de la Lutte contre les
Saint-Timothée dam. About 20 trucks per hour will travel
changements climatiques. A public hearing
this road during the day during normal working hours to
may be held by the Bureau d’audiences
transport the required material.
publiques sur l’environnement (BAPE).
Hydro-Québec will take all necessary measures to ensure
public safety. For example, flaggers will be employed,
in particular near École Marie-Rose.
Closure of portions of the bicycle network
of the Îles-de-Saint-Timothée regional park
During certain work periods, Hydro-Québec will have to
close part of the bike path on Saint-Timothée dam and
on the dike. Hydro-Québec will communicate regularly
with park managers to let them know when the bike path
will be closed.
The work will not affect activities at Saint-Timothée beach.
Natural habitats
The work will affect aquatic habitats at the foot of the dike.
Measures will be taken to minimize habitat loss, for certain
fish species in particular.
PUBLIC PARTICIPATION
In cooperation with the host community, Hydro-Québec will
implement a public participation process as part of the studies
FOR MORE INFORMATION
for the project. This will make it possible for the expectations
and concerns expressed by the public and by key community INFO-PROJECT Line
stakeholders to be taken into account so the project can be 1 877 653-1139
adapted to local realities.
JONATHAN PETIT
Advisor – Community Relations – Richelieu
Direction – Affaires régionales et collectivités
705, boul. Clairevue Ouest, 1er étage
Saint-Bruno-de-Montarville (Québec)
TIME TABLE J3V 6B6
E-mail: petit.jonathan@hydro.qc.ca
Public information
meetings Fall 2016 – Winter 2016-2017
Permitting Winter 2016-2017 – Summer 2018
hydro.quebec/des-cedres
Construction Fall 2018 – Spring 2020
100 %
2016E1249-A Ce document est également publié en français.
This document is a translation of the original French text.You can also read
